Partial traffic engineering for guaranteeing network quality

New network applications requiring broadband transfer, such as broadcasting services, are emerging and quality requirements for networks are becoming more diversified. Considering that these applications usually generate time-varying traffic in the network, which has limited link bandwidth, dynamic traffic engineering (TE) will be helpful to realize a more robust network. However, a route change performed by a TE can involve all traffic. This can degrade the quality of packet transfer. Moreover, it may not realize cost-minimum paths, which may be the best paths from the viewpoint of the QoS. Here, we propose a partial traffic engineering scheme. This scheme allows the TE to set paths that coexist with the cost-minimum paths, which can be used to support QoS sensitive traffic. Furthermore, the traffic whose paths are permitted to be reconfigured dynamically can be limited. We show a formulation based on LP (linear programming ) for this scheme and simulation results that confirms its effectiveness.